Yankee fourdrinier machine



May 17, 1932. H. R. FARNSWORTH YANKEE FOURDRINIER MACHINE Filed Dec. 5, 1928 INVENTOR ATTORNEY Patented May 17, 1932 UNITED STATES- PATENT "OFFICE HILAND R. FABNSWOBTH, OF S ANDUSKY, OHIO, ASSIGNOR TO THE PAPER 6'0 TEXTILE MACHINERY COMPANY, OF SANDUSKY, OHIO YANKEE rounnnmmn macnrnn Application. filed December The invention to be hereinafter described relates to paper making machines of the increase production are unsuccessful. When speeded up, the pick-up felt either fails to take the sheet from the wire or, if' it does take it, fails to carry it far enough for it to be gripped between the two felts.

- The main objects of the present invention are to avoid these and other objections and provide a Yankee Fourdrinier which may be successfully operated at much higher speeds and with correspondingly increased production. The invention is simple, efli;

cient, compact, and inexpensive and may be readily and quickly applied to any existing machines of this type without any alteration of existing structures.

In order to more clearly disclose the construction, operation and use of the invention,

reference should be had to the accompanying drawings forming part of the present application. I

In the drawings]:

Fig. 1 is a diagrammatic View of one well known kind of Yankee Fourdrinier, with the inventions applied, the suction 'roll being I shown in lateral vertical section; and

Fig. 2 is an enlarged lateral cross section through the suction roll.

Referring to the drawings in detail, '1 indicates the making wire on which the sheet first takes form, 2 and 3"upper' and lower couch rolls between which said wire and sheet travel, 4 the sheet, 5 the top or pick up felt, 6 the lower or supporting felt, 7 and 8 press rolls between which the two felts and interposed sheet pass, 9 the pressure roll between which and the drier the uppenfelt and sheet pass, l0 the drier, 11 the felt washer 5, 1928. Serial No. 324,032.

'These'delicate or filmy sheets are diflicult to handle at any speeds and the difficulty increases as the speed of the machine rises.

But, since production rises in proportion to increase in speed it is highly desirable to increase speed, yet absolutely essential to maintain breakage at lowest possible minimum. The chief cause of breakage has been inability of the pick up or'top feltto hold the sheet which it picks from the wire, long enough for it to reach the bottom felt where it will be supported. Another cause, has been the persistericy of the sheet in adhering or sticking to the ,wire and following around the bottom couch. 'If the sheet is toowet it I, can not be'picked up, even at theaverage speed. It will'then follow the wire. or, if the machine is running faster than a certain predetermined speed, the pick-up; felt can not function. Instead, it will simply pull away from the sheet, andthe sheet will either drop between the couches and the end of the bottom felt, or else follow this wire back. It is understood, of course, that some felts are of different textures than others and that some will successfully pick up sheets that are wetter or at greater speeds than others. But the general rule applying to them all is, that the wetter the sheet or the faster the machine the greater is the. difliculty in picking the sheet from the wire..

It is this difliculty in particular that the.

present inventionaims to overcome. To this a partition 14: running from end to end and making two separate and distinct chambers and- 16. each having a radially elongated narrow. conduitextending outwardly as -a branch from the centre to the inner wall of the shell of the roll. Each.

branch comprises two spaced walls forming asuction conduit and having packing strips in their outer edges to provide a runnmg sealing contact with the shell, as will be readily understood. The box, as a whole, is

i mounted in the usual and well known manner and its adjustment about its'longitudinal axis, which is parallel to or coincident withthat of the roll is in the usual manner and by the usual means. It is not thou ht f that further details are necessary on t is point as such mountin and. adjustment are well known to those s lledin the art. To one end of the box is connected, in any suitable manner a suction pump or-other evacuator with suitable valve connections for regulating the suction, so that a greater degree of vacuum may be effective in branch 15 than in 16. Any one of a number of such valve connections may be used and, therefore, need not 'be shown. On reference to the cross section of the suction box it willbe seen that the branch 15 is much narrower than the branch 16 and that it is so positioned within the roll as to fall just over the line where the top or pick up felt is about to leave the wire with its sheet. 'Onl a narrow area at this point is required. uction acting upwardly through this branch at this point,

, draw the sheet from the wire and attaches it to the felt. As a matter of efiiciency a comparatively high vacuum is used to more firmly interengage the sheet and felt and positively transfer the sheet from the wire to the felt. It will also be seen that the wider branch 16 is provided with a considerably enlarged operative suction area and that such area is sopositioned as to fall within the upper part of the arc of contact of the top felt about the suction roll. As this point the wet .felt fresh from the washer is greatly saturated with water. As it crosses the-operative area of suction branch 16 a large part of the water will be drawn out by the vacuum and will flow by gravity to the partition and be drawn off in the usual manner. Because of the greater operative area and, corre sponding longer operative time, a considerably lower vacuum may be used here than in I the other branch. Also, here gravityassists' stationary soktliat the action of the vacuum whereas in the other branch gravity opposes. Likewise the purposes are different in the two branches, not necessitatingas high a vacuum in the one branch as in the other.

It-is well understood, of course, thatthe shell of;the suction roll, together with the felts, and wire are all travelling continuously and at high speed,..while the suction box is a separate chambers, one of is progressive and in exact accord with the travel of the same. I

While a lower felt has been shown, as in the regular standard Yankee Fourdrinier, it will be understood, by those skilled in the art, that, for many kinds of paper, particularly the light weight, fine tissues, etc., the lower felt may be omitted. This is due to the fact thatsuch lighter papers will become so firmly interengaged with and attached to the up per felt, by the action of the suction roll-that the supporting action ofthe lower felt is not necessary.

A detailed statement of the operation of the machineis hardly thought necessary. In

general it operates just as other well known Yankee machines operate, except that, due to th1s invention it is capable of more continuous operation (because of fewer breaks) and considerably increased speed with correspondin reater production.

any changes may be made inthe construction, arrangement and disposition of the various parts of the invention within the scope of the appended claims without departing from the field thereof, and it is meant to include all such within this application where in only a preferred form has been disclosed purely;by way of illustration.

Having described my invention, what I claim and desire to protect by Letters Patent 1. In a machine of the class described, web

forming means, an endless conveyor felt, up-

per and lower. opposed couch rolls between which-said felt and said forming means pass, a suction box only in said upper couch roll having two branches extendiniradially from the ranches being operative at the line of contact of said rolls to cause the paper web to leave saidforming means and adhere to said felt and the other branch being operative at a point where the felt is not in contact with the web for the purpose of substantially drying the felt before it contacts with the web.

2. A .Yankee Fourdrini'er machine com prising an endless web forming wire, a drier .tact with the web for the purpose of substantially drying the felt before it contacts with the web.

3. In a machine of the-class described, a Fourdrinier wire, a plain bottom couch roll around which the wire carrying the paper web is trained, a pick-up and a top suction couch r011 between which and said plain bottom couch r011 said pick-up felt and wire with the web therebetween are adapted to 

